Test Description
The number(s) below refer to the step number(s) on the diagnostic table.
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Tests if ground is constantly being applied to the horn relay.
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The horn relay control circuit includes the inflatable restraint steering wheel module coil, the horn switch, and the steering wheel radio control switch. The inflatable restraint steering wheel module coil, the horn switch, and the steering wheel radio control switch must be tested for a short to ground when testing the relay control circuit.
Step | Action | Yes | No |
|---|---|---|---|
1 | Did you perform the Horns Diagnostic System Check? | Go to Step 2 | |
2 |
Are the horns on at all times? | Go to Step 3 | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems |
3 |
Are the horns on at all times? | Go to Step 8 | Go to Step 4 |
Connect a test lamp between the battery positive voltage circuit of the horn relay coil and the horn relay control circuit. Does the test lamp illuminate? | Go to Step 5 | Go to Step 6 | |
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Important: The horn switch is part of the inflatable restraint steering wheel module. Refer to Inflatable Restraint Steering Wheel Module Replacement in SIR. To disable the SIR system refer to Disabling the SIR System in SIR. Test the horn relay control circuit for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 11 | Go to Step 7 | |
6 | Inspect for poor connections at the horn relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 11 | Go to Step 9 |
7 | Inspect for poor connections at the harness connector of the BCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 11 | Go to Step 10 |
8 | Repair the short to voltage in the horn control circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 11 | -- |
9 | Replace the horn relay. Did you complete the replacement? | Go to Step 11 | -- |
10 |
Important:: Perform the BCM programming procedure when replacing the BCM. Replace the BCM. Refer to Body Control Module Replacement in Body Control System. Did you complete the replacement? | Go to Step 11 | -- |
11 | Operate the horns. Do the horns operate properly? | System OK | Go to Step 1 |
